I run a HOB filter (use media from the established display), an air line (no stone) to circulate the water and break up the surface, no need for a power head...don't forget a piece of PVC or décor, to allow the fish to have a hiding place and feel secure...it also holds the air line down attached via rubberband. Macroalgae is a huge plus in a quarantine. I don't see bio-load being a problem, only one fish, or two very small ones at a time goes in a QT.